Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
GET
Drawers in modern furniture always attract children's attention. The result can wait no longer — the contents is on the floor. If handle is removable to make, don't have to waste time...
NATIONAL AIRLINER
The Il-18. When you create a turboprop airliner Il-18 took its predecessor with the same designation, but piston engines. Special attention in the design of the aircraft, the designers...
